How to make your own On-The-Go USB cable - Electronic Products
Micro USB to Micro USB OTG Cable - 10-12 / 25-30cm long : ID 3610 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: CableCreation Short Micro USB to Micro USB OTG Cable 8inch, Micro USB Male to Micro USB Male Cable Works for DJI Spark Mavic, PS4, Owlet, Android Phone Tablet, DAC and More,20CM :
DIY USB OTG micro USB to mini USB for audio DAC - YouTube
How to Make USB OTG Cable : 5 Steps (with Pictures) - Instructables
DIY OTG Cable || How to Make Your Own OTG Cable From Scrap? - YouTube
usb - C-type cable trying to make an OTG cable but only 3 wires - black, red, and blue - Electrical Engineering Stack Exchange